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Author name code: andrienko
ADS astronomy entries on 2022-09-14
author:Andrienko, Olexa V.

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Title: The effect of energetic particle beams on the chromospheric
    emission of the 2004 July 25 flare
Authors: Zharkova, V. V.; Kashapova, L. K.; Chornogor, S. N.;
   Andrienko, O. V.
2011MNRAS.411.1562Z    Altcode:
  In this paper the role of particle beams in the generation of a
  close spatial and temporal correlation between hard X-ray (HXR)
  energy and Hα line emission bursts in the solar flare of 2004 July
  25 is discussed. The light curves in the HXR emission and Hα line
  reveal that the pre-flare and main flare events are correlated with the
  variations of line-of-sight (LOS) magnetic flux. The HXR emission shows
  three main bursts during the main flare phase, which are accompanied by
  Hα intensity increases. The latter appear in 10 locations (kernels) at
  different times in succession; the kernel locations are associated with
  strong magnetic sources situated on the opposite side from the magnetic
  neutral line (MNL). The appearance of Hα kernels in the pre-flare
  event and those at the start of the main event ia correlated very
  closely (within a few seconds) with the HXR emission observed by the
  Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) (HXR+Hα
  kernels), while the appearance of some others, not associated with HXR
  emission, was delayed by tens of seconds. Electron-beam parameters were
  derived from the RHESSI spectra in which the observed HXR photon flux
  was corrected for the self-induced electric field effect. Possible
  implications of this electric field on the production of transient
  magnetic fields observed during the flare are discussed. The Hα
  emission observed during the first burst was simulated in a hydrodynamic
  atmosphere for 5 levels plus a continuum hydrogen atom with the full
  non-local thermodynamic equilibrium (non-LTE) approach combining
  radiative, thermal and non-thermal excitation and ionization by an
  electron beam with the derived parameters. The simulated temporal
  profiles of Hα emission produced by non-thermal hydrogen excitation
  revealed a very good fit to the observed ones in the HXR+Hα kernels
  and 10-20 s delays in the other kernels. This allows us to speculate
  that Hα emission is caused mainly by electrons in the HXR+Hα kernels
  and mainly by protons in the others.

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Title: GRB 111211A: optical ovservations at mt. Terskol observatory.
Authors: Volnova, A.; Andreev, M.; Sergeev, A.; Petkov, V.; Karpov,
   N.; Andrienko, O.; Martynyuk-Lototsky, K.; Parakhin, N.; Borachok,
   N.; Kozlov, V.; Butenko, G.; Godunova, V.; Pozanenko, A.
2011GCN.12704....1V    Altcode: 2011GCN..12704...1V
  No abstract at ADS

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Title: GRB 111103A: optical upper limit of mt. Terskol observatory.
Authors: Volnova, A.; Andreev, M.; Sergeev, A.; Petkov, V.; Karpov,
   N.; Andrienko, O.; Martynyuk-Lototsky, K.; Parakhin, N.; Borachok,
   N.; Kozlov, V.; Butenko, G.; Godunova, V.; Pozanenko, A.
2011GCN.12706....1V    Altcode: 2011GCN..12706...1V
  No abstract at ADS

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Title: GRB 111210A: optical upper limit of mt. Terskol observatory.
Authors: Volnova, A.; Andreev, M.; Sergeev, A.; Petkov, V.; Karpov,
   N.; Andrienko, O.; Martynyuk-Lototsky, K.; Parakhin, N.; Borachok,
   N.; Kozlov, V.; Butenko, G.; Godunova, V.; Pozanenko, A.
2011GCN.12713....1V    Altcode: 2011GCN..12713...1V
  No abstract at ADS

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Title: GRB 111103B: optical upper limit of mt. Terskol observatory.
Authors: Volnova, A.; Andreev, M.; Sergeev, A.; Petkov, V.; Karpov,
   N.; Andrienko, O.; Martynyuk-Lototsky, K.; Parakhin, N.; Borachok,
   N.; Kozlov, V.; Butenko, G.; Godunova, V.; Pozanenko, A.
2011GCN.12546....1V    Altcode: 2011GCN..12546...1V
  No abstract at ADS

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Title: Variations of the fine structure of Fe I 525.02 and 525.06
nm lines in the sun-as-a-star spectrum: manifestation of the
    "solar noise"?
Authors: Osipov, S. M.; Andrienko, O. V.
1998IBUAA..12...39O    Altcode:
  No abstract at ADS